The phrase "dead cert" means something is very likely or certain to happen.
Sentences with «dead cert»
Liverpool goalkeeper Danny Ward is unlikely to start because of the form and fitness of Crystal Palace stopper Wayne Hennessey, but Spurs left - back Ben Davies and Gunners midfielder Aaron Ramsey are almost dead certs for a place in Coleman's lineup. (caughtoffside.com)
If Arsenal do make a good start to the campaign though, as we all expect them to, then there is going to be an absolute dead cert, although whether you can find a bookie to take your bet is another matter, and that is for Wenger and Jose Mourinho to have a public spat with each other. (justarsenal.com)
Ok may be give the back up keeper some matches in the 2 domestic cups, but certainly not the finals, give him some dead rubbers in the champions league and may be one or dead cert home premier league games, against the likes of Norwich, Bournemouth, Watford, etc.. (justarsenal.com)